package top.zhdev.community.controller;

import com.google.code.kaptcha.Producer;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import top.zhdev.community.entity.User;
import top.zhdev.community.service.UserService;
import top.zhdev.community.utils.CommunityConstant;
import top.zhdev.community.utils.CommunityUtil;
import top.zhdev.community.utils.RedisKeyUtil;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 登录处理
 */
@Controller
public class LoginController implements CommunityConstant {
    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Resource
    private RedisTemplate redisTemplate;

    private UserService userService;
    @Autowired
    public void setUserService(UserService userService){
        this.userService = userService;
    }

    @Resource
    private Producer kaptchaProducer;


    @GetMapping("/login")
    public String getLoginPage(){
        return "/site/login";
    }

    @PostMapping("/login")
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner){
        /*
        1. 从session中取值，检查验证码
        2.从cookie中取出owner键，取redis中值
         */
        String kaptcha = null;
        if(StringUtils.isNotBlank(kaptchaOwner)){
            String kaptchaKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(kaptchaKey);
        }

        if(StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)){
            model.addAttribute("codeMsg","验证码不正确");
            return "/site/login";
        }

        // 检查账号，密码 设置过期时间

        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String,Object> map = userService.login(username,password,expiredSeconds);
        if(map.containsKey("ticket")){
            // 向浏览器生成cookie
            Cookie cookie = new Cookie("ticket",map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        }else{
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            return "/site/login";
        }
    }

    @GetMapping("/kaptcha")
    public void getKaptcha(HttpServletResponse response /* HttpSession session */){
        // 生成验证码
        String text = kaptchaProducer.createText();
        // 制造图片
        BufferedImage image = kaptchaProducer.createImage(text);

        /* v1. 将验证码存入session ，效率低
            session.setAttribute("kaptcha",text);

            v2.将验证码存入redis，过期时间 60s
         */
        // 验证码所属
        String kaptchaOwner  = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner",kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);

        // 将验证码存入redis
        String kaptchaKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(kaptchaKey,text,60, TimeUnit.SECONDS);

        // 将图片输出给浏览器
        response.setContentType("image/png");
        try{
            OutputStream os = response.getOutputStream();
            ImageIO.write(image,"png",os);
        }catch (IOException e){
            logger.error("相应验证码失败：" + e.getMessage());
        }
    }

    /**
     * 获取注册页
     * @return
     */
    @GetMapping("/register")
    public String getRegisterPage(){
        return "/site/register";
    }

    /**
     * 用户注册
     * @param model
     * @param user
     * @return
     */
    @PostMapping("/register")
    public String register(Model model,User user){
        Map<String,Object> map = userService.register(user);
        if(map == null || map.isEmpty()){
            model.addAttribute("msg","注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活");
            model.addAttribute("target","index");
            return "site/operate-result";
        }else{
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            model.addAttribute("emailMsg",map.get("emailMsg"));
            return "/site/register";
        }
    }


    @GetMapping("/activation/{userId}/{code}")
    public String activation(Model model, @PathVariable("userId") int userId,@PathVariable("code") String code){
        int result = userService.activation(userId,code);
        if(result == ACTIVATION_SUCCESS){
            model.addAttribute("msg","激活成功，您的账号可以正常使用了");
            model.addAttribute("target","/community/login");
        }else if(result == ACTIVATION_REPEAT){
            model.addAttribute("msg","无效操作，该账号已经激活");
            model.addAttribute("target","/community/index");
        }else{
            model.addAttribute("msg","激活失败，激活码不正确");
            model.addAttribute("target","/community/index");
        }

        return "/site/operate-result";
    }
}
